Means for elevating pulverulent materials



` Dec. 16,l 1930. T. J. `TELLJsl-'SEN MEANS FOR ELEVATING PULVERULENT MATERIALS FiledMarch 9 2 Sheets-Sheet l 2 Sheets-Sheet 2 yDee. 16, 1930. T, J. TELLEFSEN MEANS FOR ELEVATING PULVERULENT MATERIALS Filed March 9, 1928 Patented '16,

y UNITED ,STATES PATENT oPFlcE THEODOBE J'. TELEFSEN, 0F CINCINNATI, OHIO, ASSIGNOB TO THE J'. E. DAY COI- PANY, OF CINCINNATI, HIO,A CORPORATION Ol' OHIO l IEANB FOB ELEVATINGIULVERULENT MATERIALS appunti aies ma e, 192s. serial no. 260,420.

, This -invention relates to screw type elevators for conveying finely divided materials such as flour,powders, and the like.

An' object of the invention is to provide a i screw type elevator which will. elevate pul-- .verulent materials in aneilective manner.

Another Objectis to provide a device of this type which is so constructed that the flour or powdered material being elevated is precluded from objectionable packing about the lifting and conveyor screws.

Another object is'to provide a device for the purposes stated which is simple of construction and operation.

These and other objects are attained by the means described herein and disclosed in the accompanying drawings, in which:

` Fig. 1- is aside elevational view of the device, parts beingbroken away.

flg. 21is a cross sectional view on l1ne 2-2 o 1 Figg: 3 is a view showing means whereby the material being elevated vor conveyed may be projected to elevations exceeding that indi-l 25 cated in Fig. 1.

In screw type elevating devices heretofore vused for conveying and elevating substances and materials such as flour and powders, etc., it hasA been found that'after the material has been elevated toa certain height, packing of the material about the elevating screw takes place, thereby precludin further upward projection of the materia By utilizin the means illustrated in the drawingan described fin the'specication following, such packing -of thematerial is recluded. Other f advantages also will be ma e apparent in the description. n

rThe device comprises spiral screws 5 6, 7, and 8 rotatably supportedjn tubular ousings 9, 10, 11 and 12, respectively. Screws 6 and Smay be termed elevating screws, and screws 5, and 7 lead or feed screws. Feed screw 5 is provided with a shaft 13 suitably journaled in bearings 14 and 15 of a hopper 41 and lower casing'16, respectively. Feed or lead screw 7 is likewise mounted in a bearing 18 in a discharge casing 19 at the upper end of the elevating screw. Elevatin screw 59 6 is provided with a shaft 20 the ends o which are mounted in bearings 21 and 22 provided on the lower casing 16 and discharge casing 19, respect1vely. As shown in Fig.2 the tubular members 9 and 11 are positioned in offset reladriving a sprocket 31 fixedly secure on shaft:`

15 of screw 5. On the opposite end of shaft 28 is fixedly secured a sprocket 32 which drives a sprocket 33 on the shaft of lead screw 7 by means of a-second chain 34. The shaft' of screw 7 is also provided'with a bevel gear 35, ke ed or otherwise fixedly mounted thereon. aid bevel gear is adapted to enga a second bevel gear 36 mounted on a sha 37 which is suitably journaled in a bearing 38 extending from the dischargel casing 19. The opposite end of shaft 37 has iixedly mounted thereon a spur gear 39 which engages a spur gear 40 fxedly mounted on the shaft of elevating screw 6. The means just described imparts rotatory motion to the elevatin screw 6 and lead screw 7. It should be no that the gears and sprockets are of such size as to drive the screw 7 at a speedgreater than that of the elevating screw 6. The reasonfor thus gearing the said screws will be described later.

By providing sprockets 29 and 31 of a proper size, the feed screw 5 may be driven at a. great-er speedthan the elevating screw. Screw 5' has one end thereof extendin into a hopper 41 into which material may fed during the operation of the device. It-should be noted that the offset relationship of screws 5 and 7 to the elevating screw 6 is such that the lead screws rotate in close proximity with the blade of the elevating screw. If desired,

the tubular member 11 shown in Fig. 1 mayA provided wit-h'means whereby a tubular mem- -ber 12, supporting elevating screw 8, may be driven screw 7. The ratio of gears 44 and 45 vms c5 to great heights.

is such as to drive the elevating screw 8 at a speed slower than that of screw 7. The means just described provide for rotation of the elevating screw 8 .whereby substance being conveyed may be elevated to a height considerably greater than may be attained by a continuous screw 6. It has been found that a single elevating screw is capable of elevating substance such as iour or powdered material to a certain-height. When it is attempted to elevate a substance beyond this point, the substance becomes packed about the elevating screw with the result that the substance rotates with the screw and is not ejected at the top ofthe screw housing.

The operation ofthe device is as follows.

- It is assumed that the screws are of equal pitch and diameter. Flour or other substance is fed to the hopper 41 after the device is set in operation. Lead screw 5, rotating at a comparatively high rate of speed, conveys the substance to the lower end of elevating screw 6 in quantities in excess of the normal carrying capacity of the elevating screw. The su stance thus fed to the elevating screw 6 is easily picked up by the elevating screw and elevated to the uppermost polnt thereof, whence it is quickly removed by the compara-4 tively high speed screw 7 and deposited in housing 42 at a rate in excess of the normal carrying capacity of elevating screw 8. Screw 8, rotating at a speed slower than that of screw 7 thereupon picks up the substance from housing 42 and elevates it to a greater height. It is obvious that by providing additional lead screws 7 and elevatin screws 8, the substance may be elevated inde nitely.

vIn the foregoing paragraph, reference is made to elevating and lead screws driven at different speeds. It is possible of course to obtain the effect of said diii'erence ofV screw speeds by rotating said screws at equal speeds, provided that either the pitches or the diameters of the screws be` une ual. In other words, the eiiiciency of the device de ends to some extent on providing screws of ifferent carrying capacities.

.It has been found also that by varying the pitch, speed,l or size of the .screw elements, finely divided chemicals and metallic oxides of various specific gravities may be elevated It is to be understood that various modificationsmay be made in the structural details of the devicev without departing fromV the spirit of the invention.

What is claimed is:

1. In an elevating device for powdered substances the combination Iof an upright housing having upper and lower ports, an elevating screw rotatable in the upright housing and extendin beyond said ports, al tubular second screw ousing having a port in communication with the lower port of the first housin a feed screw in the second housing for fe 'ng powdered substance to the lower portion of the elevating screw, the screws be 1n disposed transversel of one another in di erent planes with t eir peripheries in close roximity.

2. n an elevating device for powdered substances the combination of an upright housing having upper and lower portsan elevating screw rotatable in the upright housing and extendin beyond said ports, a tubular second screw ousing having a port in communication with the lower port of the first housing, a feed screw of hi her capacity than the elevating screw rotataile in the second housing forv feedin owdered substance to the lower portion o t le elevating screw, the screws bein disposed transversel of one another in di ferent planes with t eir peripheries in close proximity.

3. In a device of the class described the i angularly to the upri ht housing and lhaving c communication with t e said casing, a 'closely fitting lead screw in the second housing, said lead screw extendin beyond the housing, with the eriphery t ereof closely adjacent the perip ery of the elevating screw and means for rotating the screws at diiizerent speeds.

4. In a combination of an upright housing having upper and lower ports an elevating screw rotatable in the upright housing and extendin beyond said ports,'a casing at the lower en of the elevating screw housm into which the lower extendin portion o the elevating screw is receive a tubular lead screwy housingidisposed angularly to the upri ht housing an having communication with t e said casing, a closel fitting-lead screw in the second housing, sa1d lead screw extending be ond the housin into the casing, the longitu 'nal axes of the ead screw and Aelevating screw being dis osed in different planes, and power means or rotating the screws.

5. In adevice of the class described the device of lthe class described the :ings

which are dlsposedtransverselygothe axis ofv fthe tubular rhousing and. Spacedfl therefrom, ran elevating screw. in the 'saidlhous'ing, the

combination of an upri ht tubular vhousing a casin on each end of t e housin said caseing `provided with portst e'axesof screw having vanedl ends eiteiiding into the casing on the :ends of'jthe'housing, a lead screw housingommlnii tigwith the port of the lowercasing, :a vrot:st table lead screw closely 'ttin vwithin'said" housing, the pe- .riphery of t e lead/screwy being disposed closely adjacent the vanes of the elevating screw, and a conveyor screw and cooperative housing communicating with the port of the upper casing for conveying material lifted by the elevating screw. y

In testimony whereof, I have hereunto subscribed my name this 28th day of February,

THEODORE J. TELLEFSEN. 

